Round # partitions up to fill the last GPT table sector

[marcel]

Summary

Set the number of entries in the GPT header to a multiple
of the number entries that fit in a sector.

PR: 236238

[imp]

btw, I scrolled past the .uu files assuming they were correct.
Do we still need the uudecode dance? Though that would be a different commit

[marcel]

Yeah, I don't like the way we now have the master files. I think I was too much focussed on keeping the file size small and opted to compress, followed by uuencode. But it's a real pain to work with. For one, you can't diff the rebased files after a code change and see if the new behavior matches the expectation. And on top of that, diffs tend to be much bigger than a one-liner of the hexdump output.

I think I'd rather just have the output of "hexdump -C" as-is and not compress and not uuencode the compressed file.
I can definitely do that.
Sound good?